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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d5fd0136a3e053388079e5cf3a6988303d38ca7a6ac0c0e8de7910b1b13dac' 
  AND token = 'pQ9yNltSYCfxqrJg307cRC4HEhj1NvJilRO10Q+v6rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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