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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e67a4329fd9d7850ed5fbe7a22f84305e25da75f0e9911668f06e40837eb09' 
  AND token = '3JCYRliz3qSojxS8bp2DgSLgi7+q5LLZ+XRZBdOrGSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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