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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dac787a9d1359fca61ee6b147de1fc8df908d08d2e42aa01b0f79a2397497b' 
  AND token = 'SxxH2KNGKb7KM0W7wL1kzC1aBP2EckmJp4t+GQfRgaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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