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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392d6b93547d8c2c2b44a1a9d46e8a8b7ac830199d1b47edc6e00a3ae7aaedbb' 
  AND token = 'ccY+FEW7rAmHVS7Ua13YbcZ4j2U8N7hu4ho1S8q/mNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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