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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0856dd8648e17f22b88a16afca082f8669ec5560e447ac06d9f69e908dbd18a' 
  AND token = 'PqXC7F/n/ZjPIUsykJDgH/Rhvd48wyvmoPabcLq5yLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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