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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994762ffa3c640448214ca603a7e96ab7f360294acdcc21970ba232e9db1e94f' 
  AND token = 'lYo68g3EXN6EnQUke59Yy+cIXJuvtlHZ0STWiWhJ/Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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