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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d099ad1765b91953dd11979f5973b1e9c2ef83b9590d8fca301dc92247c9eb' 
  AND token = '9Ex7wxgNhlfDq9f/6xUhokjYZUum3LrIiAR9v59Sjc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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