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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2877f66e2be8fa8091734844e3713cb63889260af189bf24e8f931a04dbe602f' 
  AND token = 'nlFY1KxNM7DmHNo3ik/9BS0NyvWr14b2Ii3nxfZAsQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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