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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd724e872e30f66a9a5b738fd746edc4e1688048d1bce7241e5095a6a7804f478' 
  AND token = 'R2qxDiip8CfQghxZBYaSL0IJ2hOQHqIcw8OHv/k/bps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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