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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6825b255d58b2fdc56dc81a2be8bcb10673acaf8c3f89448eb981a7f6698ae' 
  AND token = 'xk3M0Erfc+h0c+K/gaYxMX+mumUQnRd7/VPgenvPz3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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