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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b1a3a1f9f9056e658a6d8ddfc39c1c80f6c61f24537111a62212a58ffe7f1c' 
  AND token = 'FMtfguGsETcTxZg3WZPNwtNThXplXPU44bnZeiKkJCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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