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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adfa06205f5867a0d5fc399e349eede46da91a5d82ba31cf6065246cd89f19b' 
  AND token = 'hzk49pJv6HZ849xUQsu/h7ryRH5D5TYpDFPjswhIU3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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