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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4319f3fa6d9f1206c9d4d5fd998e9f9a72f0ebc53f875da0625d3a0edf46ed' 
  AND token = 'CynGnb+vG9KkTbIVoP8fECEyccvY/BY4B0GYk7iXFfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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