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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d14c3756f83004d2ce3f8d62ed0456434c2dedbcf37850e84f6e9ec28244bb7' 
  AND token = '9P8+d7Q6zuSIuaERWcZcpEkgFIeoclcMrLt+qKx+cVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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