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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f62b22fa9d79275c4aa3f6e840ca8d508164e53648681525bd927ca2b3fe3c' 
  AND token = 'OXqcreTL/016xzhPlASthqGosszvl8wwXyCvrr8TyKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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