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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42f2631e89b1f87c6ad42685d6b7775909f908445cf6c095c98b7d2ef26c9e6' 
  AND token = '4PGKNVVQiK+q3I7Vjs49+mbAAKb4MfqzD9RV7LQo2cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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