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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745f09d5f5e1a6e95c0f79385e63a280d0126c33d94ad7d1ac5134b26464deab' 
  AND token = 'BDdVZ/Fs4GjsJzvys3MJ3jICSggeII48kkezrO1FA0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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