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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5344363545a1fc3ef4e96eac0aa9ed177cb1ba8343e845d97fafadc8d5bed12' 
  AND token = 'd1HalPyyhqj78RCNXlrbrsB/WmlXItbcYt+ysl+z+HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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