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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285adb5e7bee58c8684eb37fd329ba520128b1166077b34a2b9f548479c400a0' 
  AND token = 'qLjnidNJ2wprsAdKfblr/aDw9AhZoPTl+/Vkysy72kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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