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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901bdb1e25dce8c86149621e9bba277d072e8f4b1048968aa86296926895fb7b' 
  AND token = 'OF6jYStK8IS3nmy0v7Ig1EhuZKqnUjtMIka+pk3cO3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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