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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044249c70e4c1beea96ea0be8be5e75e12d3b279a1b2f3db5f0ca6cd20195264' 
  AND token = 'Kr+ueuwwT7Tz5nKHbwS+OQ9VYBH6c9WGzbIu8ErPAJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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