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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ec9d874788065c57a93973cb69ff93c4176e05463a34cf05e4df87e79834e3' 
  AND token = 'Jyl7lk1JLw88s10JtBx0R4z9KHR6pB52oeyMDWahRAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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