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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438bf10b6686701933d0c741352252dd26f6067c18a5a1a08368c1ea52738d42' 
  AND token = 'LBfXQftzSX+D8+g3RqdsCMhf+QakAF9t1jpMuPektlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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