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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2432c51f833428f721e9a4a70018b91bc70b3a29940e0e8f984aec59efd7b3a5' 
  AND token = 'A5ixezaIVpr/vv7tjaKnvLaXoofxHECmM/Z6L2QKnxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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