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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ee780066e02c2bc5c30d705f5ebf9a1aebe230bcf7159ec823a32d4799dbe7' 
  AND token = 'Svwy44xD9+M/lEylr3ug2mWP9olWUa06UBEerJdcXjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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