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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ee2407d150bf4fea2705d3b71e6fae279abe44ef3cac20f2d00ee9c7a4336b' 
  AND token = '9dTkEdT9fijed2ra/5DFajRIHicxEVUPgrL3KCItl4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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