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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653d38a63e3749cb7ba1241dd7457cc4f95b759509882d73e7b1e3f22f3ebf17' 
  AND token = '965BYtib5fxtpeGYDLsclCO7L10vN/mhIuZdtTrTavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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