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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94101aba88a49e3ce2c409172a0ccac1456e5180aab756ff5390935ab61b2504' 
  AND token = '9bnDg9R3N8qvqXQPj6UcyfYWy6U1Lr5R5qe5j2wSS/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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