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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c711b2b72f98f8dd3172f8574328bd365e1e35df45e2117a4071ac1e55cb1e92' 
  AND token = 'dgOV09dXm0azLiubxs+i4JMisY9WYfR4RtRPyZcxbyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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