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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74744c84d19dfcae8e1133bbd4fb57a0eae9b875c673a884e9005d686c614b97' 
  AND token = '07fNHW/iJ+HJ/8JkZrAIJZ8z1HwdefNAflmbR9BGxfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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