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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a64ec8335934419f4850f6faffb35c9a4369bc535404fc41d718f9771d49fd5' 
  AND token = 'WjTmFoHxq1l+b9+ddL21ZsnPdgCoWYq92go2oNgViGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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