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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8573703a0c0538f7cf54f786d6afd88bc6db8cbdc06eb442b97a136cab66e72' 
  AND token = 'KWchwGfdae2/DKnnjYc8Y8eEKVGiVll1B6fyTpZfCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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