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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80fdd7728e38be237bd291786b96f4b4e2062f5307f8dab420f44b49f2e5eaf' 
  AND token = 'LOdurjtAC+mmF3fu4wwOH4pHMvMjtQ6k3f7y++azSp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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