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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69afd5543365b4b63be47e7e684bb04af7b9001d53e50b5402664da70689ee6' 
  AND token = 'dmEwcVinh6kVA7grht99RhOKGdEFNSm32ChJmg5NbDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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