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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512ef3eff51c10ec649f0d223d79d4316f19e72415e4c14191d2341f6a90cd0c' 
  AND token = 'peuRpBmG3kt75bNzVLCEYaVMXskCXD3DLvnZE6QU8WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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