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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7359adfb3a58e4b86cb7d86c6dc3c0c783a6c2a560bcab55058d35caa9897232' 
  AND token = 'Xe+xm0eQrrUmofwP4KDXs88zFOMyStmexO5GjvQH3yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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