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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7029c06714844c7ddbf569240545007994ba524266522ef7eba4e497975a748' 
  AND token = '1mMgI6HMMRp8yfEMKmRxEe9hzsVZFUWyy2yEsJJAAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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