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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd435bf75653c13ba878cefd8299eaf93a6b32914b13f43ba33d02226a4d032b6' 
  AND token = 'b8H3YweP30cVoF2Yh+j5qunKoimI0O15qSYJ+dgn2YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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