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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbbccbbf33431dcd0f366ad8d808741d29f3f0178c232c386ab792adfb182a9' 
  AND token = 'z6geZ78X7aQUEwuLVvUCP/EudpdQ7VCzq44AKjrfpsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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