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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5f89b4624884eb16f6afbe679424e044086b7ae6b5e155930344df3bc84ecb' 
  AND token = 's4yUqqqgm/2ujOSDFC2eF1FNt7XhppKPdHK0FlzGLvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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