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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d14246cbb63b4c0fe9e3dca2bce89f15536cba3aaff097a2bf2b3153b5ea090' 
  AND token = 'awpHXIq/YLBvF0ZRQzfClDCxlmwiB8o5dBJ0HcVoVTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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