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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079683dc0297d075c8fcb214dd2957066ead0a481ad92b50f8f9ed3daaa4fac0' 
  AND token = 'Lc3HHXTJBGB1iTOnxyxAdFX0cTm8ibZ/pBZDqOaZCLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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