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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1674bc5992e5fb94d0e77973dc3e2c95e9ba43fa6bec0fb08084ad8444959a2a' 
  AND token = '+M70N5zdlV4xJfloIq6Ho16GQ3chmoj6HFuc+P2jyS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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