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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37107645a38438a9adeb274f96b9e87aa0d0b478af451c8b9bc353a9b6db58f0' 
  AND token = '02ljR531F0Rylx/cK0vgg9mdOGH6r1w5RE5VdQZO768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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