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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56f4f3adc03d1fed59df6cf3eca19ec65d527cada47020e9fbe7215f16e5ae4' 
  AND token = 'wgLke4OOUi7d8d2H5HgZFwIjvm01k1sA3o91AGuDHCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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