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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d2740420c7eb8a7e44fb6fa2176b4cc307c155c365a546b0b41770abeb932d' 
  AND token = '5vVEjuR4ttuKKfbVAWMK6t7mqVWgn1FisdLsRWvbAJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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