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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f324682197007319d43d9c1bcc468a435f7347c8d22a42fb40e4fe7367d934c3' 
  AND token = 'ozCs47rhodJdwy0FP2MEIQNevR2/XXQ7xcpnzMj/auw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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