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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9986c789f52a26449f6c4ae9d37cea8662de47c4fab8b7a1da76bd88832d6fb5' 
  AND token = 'k1iG14TVi78BBAKowgwo0XPfR13n5W7wHpeK1vdoDDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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