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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926556eb2cbb4ae20c9ebb498c0701a5cf51e4b508dd058c25c0fa5316b772ca' 
  AND token = 'OpSFTKHJJ8HYOLv70Mzge19+yQJP+3J3ZjzXiH5A7D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}