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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c790a69a9aa5f8f598ce0c05b54de659cdff25df926f0f8dea80a2f89aa62fea' 
  AND token = 'vtUVRTiRdm2vM6ZF8JY4u0l4ZDynQgc6grN6uCLqczU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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