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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce4206aa5f4f9e1c802c1cc6f18f44b3357b0445e962b4bfa019a5064393319' 
  AND token = 'J6i0UTLTuPLzqc69pLGIRsKFXD20ReocCrwPzugp29E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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