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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189ba6d057d740a7f92d6bf38b9c59522dd14401bf5597ebf77fd7f594f6e84d' 
  AND token = 'J8uhswNZ2B09YFaBqeTme1bWlYlAEk3qCSVA5niGmQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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