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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1885a68ee52dbce290c6eefdc45fd5fe824f633533be6e9eef82d3c9530f4e51' 
  AND token = 'cCa72ddDRRWW8Zrf40HIT4grV1QCc0bL6PBEFmtjMDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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