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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710fdf6e0aec57c7523fa8ec9490cbea36aa2fbe8ee60a9e46cfd66ed4677b2f' 
  AND token = 'R2w8zkztL0h7PegGEiPBls/T7pLCWOTqDVIT4jxRCOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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