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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc474e66415de7e6a958ffcf918ed369062b2f77bcd7c3420dc9e2054b76c53' 
  AND token = 'pAMBTYULc1MsFlEMuylof8tFtwB8QedAeoesOBVztGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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