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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ac34db7c3e5d8507a3a964bbcbc6231eb3fbac0b925495ce548ed11e3c9017' 
  AND token = '5FGuSItkHliOuxObi2Nvc/M3rUHKT2LSHDuWw6XHMI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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