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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319b8a035416c74e63273b65b2ed7b57221851d92ddf7e6bc8c208048f3d5509' 
  AND token = 'qkN4g1BqjB+Pte6FkCnHDTNGdyoA6J/iESRh0QjAAOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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