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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd186de3a0f112928a752a74944fb65c583163c41abc04048876f2f29abea57' 
  AND token = '/jn8WzEsEg/8vH6DL+1FOVl3XP0helKnFLbELlffQ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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