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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7679a9a3672e77c5abf4ae31083269d9913c2a4b3841737931929e1e0d0363' 
  AND token = 'prxl2zrcFDA7J69Hkgz1jT/hytXXC3FFKIdJbe5TihU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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