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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2958a2d18d4d2bcdcf20878ba94ddc8ad764d0850524c939d80e6af5732c06c4' 
  AND token = 'PC1lZRVcRZjEvOlZNA1SPibgUwHT2X489RHOAcxGs9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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