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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01bb23200b4ab6ceee0862f35f2fc53ada8f1ee8a2b098a58469b970cb2e7a7' 
  AND token = '+oEvjUM3XQyr6mNEuHhBFZsKgkbm+fDtuLS8R45ObT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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