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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2169c9764379986bef8e1c8ae849ad5f5cfe45a7122f8321ae56c58ecf9c00' 
  AND token = 'my0cff54+J77HN+ace1/8SlKjBVBLvn0BZPUFa8aPO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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