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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6d5ab72e321e3231220392281044aac320840bc6b31c13d3c2bad6cbe309c1' 
  AND token = 'pa8MX0I+MFI1qNvFU2NyPLXDzZsHV/Gw9PCRQ2KjRHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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