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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6613b3076b4daa961ee1102ac66f8892682006868778c4dcb42fc06f37b67385' 
  AND token = '529Eok1EWNeKyddzHF5CKIdjiDWJQXq+mmPZYvjUyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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