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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662e6e8e2e3df293b293940fd759fc9b53b2943c1e7564b27e5cd52c2a694b0b' 
  AND token = 'rvqTaIiJMYsSpIZAibEY8ynv0CZo0o6qPvhHXZq4caE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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