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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1898efa5130d5500cbcf090409c2b60f884e39634e8239da031683b5004309e8' 
  AND token = '8GETMpdqfC6+mT0FEqytXbsg92TPIWvAIaT70AJ/+VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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