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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d042e257ae41d61e5241cbd94b1f995204c01f26de324dde41ffd4020743b8f' 
  AND token = 'BFOm3F9H+od09U3v8reawymrardiktiASQ0VQm1w/ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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