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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5308e62da01a95c5b884d7ded15006b5d8e4dfb17de39a006cd414cd92ce8ebd' 
  AND token = 'jq+X/M6Y6csol4PsxPzkXbsNzsN+yVwL45aG5UwolcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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